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Step 1: Verify the Bandwidth Latency
Open any of your frequently opened website in Internet Explorer.
If there is any lag opening a URL the internet settings. Refresh the settings and try again.
If you still come across a prompt, “Page Can’t be displayed” or “Connect to the Internet”. Turn off and on your wireless router or the internet switch and try opening the URL again.
If the URL still doesn’t open, contact your Internet service provider before the next step.
Restart the computer system and try again.
Set the Internet Explorer as the default browser.
Try performing the steps where the QuickBooks update Error 404 has occurred to verify if the problem was fixed.

Step 2: Tweak your Internet Settings
Open Internet Explorer and select Internet Options from the Tools
Click on Security Tab and select Trusted Sites and click Sites
Add *.intuit.com and *.quickbooks.com as trusted sites
Click Close followed OK.
Log off from the company file and Close QuickBooks.
Reopen QuickBooks and open the company file and perform the job where you encountered Error 404.

Step 3: Update and Repair your QuickBooks
Open QuickBooks and go to the Help menu.
Select Update QuickBooks Desktop and completely update QuickBooks.
Close QuickBooks after the update completes.
Open the company file and try again to perform the steps amidst what the QuickBooks 404 Error popped.
If you still have the error, initiate QuickBooks repairing as mentioned in the following steps.
Press Windows + R at the same time once from your keyboard.
Type “Appwiz.cpl” in the box on the bottom left corner of your screen and click
From the list of Installed Programs select Your QuickBooks and Click Repair.
Wait till the time the repair process completes.
Check if the QuickBooks Error 404 popped up again or it is fixed.